Baud Rate Maximum Cable Length
9.6 / 19.2 / 93.75 kBaud 1200 m
187.5 kBaud 1000 m
500 kBaud 400 m
1.5 MBaud 200 m
3 MBaud to 12 MBaud 100 m
Branch lines are generally permissible for baud rates of up to 1500 kbit/s. But in fact they should
be avoided for transmission rates higher than 500 kbit/s.
The line ends (of the bus segments) have to be terminated using bus terminating resistors
according to the drawing below. The bus terminating resistors are usually placed inside the bus
connector.
390 Ohms
220 Ohms
390 Ohms
VP (+5 V)
GND (0 V)
RxD/TxD-P
RxD/TxD-N
Data Line B
Data Line A
6
3
8
5
One bus segment can have up to 32 subscribers. Using repeaters a system can be expanded to
up to 126 subscribers. Repeaters are also required for longer transfer lines. Please note that a
repeater's load to the bus segment is the same as the load of a normal bus subscriber. The sum
of normal bus subscribers and repeaters in one bus segment must not exceed 32.
Station 32 Station 61
Bus segment 2:
max. 30 stations
+ 2 repeaters
R
Repeater
RR
Repeater
R
Station 1 Station 31
Bus segment 1:
max. 31 stations
+ 1 repeater
R
max. 200 m max. 200 m
Fig. 11: Principle example for a PROFIBUS-DP system with repeaters (1500 kbit/s baud rate)
1.3.8 PROFINET
1.3.8.1 CM579-PNIO
● PROFINET I/O controller
● Integrated 2-port switch
● XC version for use in extreme ambient conditions available
Bus Terminating
Resistors
Repeaters
Communication Modules (AC500 Standard) > PROFINET
2019/04/173ADR010121, 13, en_US134
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